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You will get input and output voltage graphs like the ones shown below. Enable the tracking crosshairs and read the values at 1GHz. Note that when you have multiple plots, the tracking crosshairs read the value of the highlighted (selected) plot. The input and output voltage readings are 535mV and 2.941V, respectively. Therefore, the voltage gain must be 20*log10(v(OUT)/v(IN)) = 20*log10(5.5) = 14.8dB. The input voltage value shows that the default 1V voltage of the source VS has been almost equally divided between the source resistor and the amplifier circuit.
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Using the tracking crosshairs read the values of the two gains at 1GHz. The power gain at this frequency is 15.12dB and the voltage gain is 14.83dB, which agrees perfectly with your earlier calculation. Note that power gain rises to a peak around 825MHz, while the voltage gain rises monotonically. However, both input and output voltages of the amplifier start to decrease with increasing frequency. At 1.5GHz, the output voltage is about 1.5V.
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